DON'T forget the "Bend and Snap" Elle Woods' signature pickup move in Legally Blonde works here too. "Try a standing squat to see if the back gives you a wedgie, check the back to make sure the edges don't creep down, raise your arms to test that the top is secure, and bend over to make sure there's no chest spillage," says Romanowsky.

DO check the fabric: Once you've found your suit, she recommends pulling the fabric to make sure it's got good stretch. "Suits made from poor-quality nylon will wear thin quickly," meaning you'll have to repeat this whole bikini-shopping process—who wants that? —Christina Perez